JPS61100996A - Automatic feeder for printed circuit board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention automatically solders electronic components onto a printed circuit board while transporting the printed circuit board (hereinafter referred to as a printed board) on which electronic components are mounted using a conveyor belt. This relates to supplying printed boards to soldering equipment.

[Conventional technology]

Conventionally, the efficiency of soldering work has been improved by using soldering equipment that automatically performs flux application, drying, preheating, and soldering processes by simply gripping the printed board with a conveyor belt and transporting it. It had become. However, when soldering, if solder drips like icicles onto a printed circuit board or creates bridges between wiring or terminals of electronic components, the circuit will short-circuit and the product will be defective. Care must be taken not to cause purifuji. In recent years, as electronic devices have become smaller and lighter, it has become necessary to increase the density of electronic components on printed circuit boards, creating a situation where the above-mentioned icicles and blobs are more likely to occur. To deal with this, the processing speed of the soldering device was adjusted and the temperature of the soldering bath inside the soldering device was adjusted, but the effect of the adjustment was small, so the temporary passage of the print to the soldering bath was These problems have come to be solved by adjusting the angle.

The method of supplying printed boards to such soldering equipment is as follows:
Printed boards were manually loaded and gripped one by one onto the conveyor belt of a soldering device.

[Problem that the invention seeks to solve]

In this way, the printed boards are fed manually, which not only requires the operator to be present (but also requires care to avoid dropping or colliding with the printed boards when mounting them on the soldering equipment). However, it is complicated, takes a lot of man-hours, and has a limited work efficiency.As a means of solving these problems, the applicant of the present invention has proposed a loading section for a rack on which multiple printed boards are mounted. There is only a setting section for setting a rack in a predetermined position, and an automatic core supplying device for taking out printed boards one by one from the rack and supplying them to a soldering device (Japanese Patent Application No. 58-237030).

The present invention makes it possible to automatically carry out the conventional manual feeding of printed boards to reduce the burden on the operator, and also to make the printed board feeding mechanism of the proposed automatic feeding device simpler and more reliable. The purpose is to improve the efficiency of soldering work.

[Means for solving problems]

According to the present invention, the present invention has a carrying-in section for a rack on which a plurality of printed boards are mounted, and a setting section for transferring and arranging the racks at a predetermined position, and a central part of the rear end of the printed boards of the set rack. A guide conveyor section that guides and feeds both sides of the printed board, a vertical drive mechanism that sets the height of the guide conveyor section, and an angle drive mechanism that sets the angle of the guide conveyor section. This is achieved by providing an automatic printed board feeding device having the following features.

[Effect]

When the printed board is set in a predetermined position, the rear end center part is pushed by the extrusion mechanism, and it is placed on the guide conveyor part. The angle and height are set and the conveyor belt is fed by the guide conveyor section.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 to 5.

FIG. 1 is a partially sectional side view showing an embodiment of the present invention, and FIG. 2 is a partially sectional plan view of FIG.

1 is a soldering device, 2 is a conveyor belt of the soldering device, 10 is an automatic feeding device, 11 is a side plate forming both sides of the automatic feeding device 10, 12 is a base, 13 is a holding arm extending from the upper part of the side plate, 14 15 is another pair of side plates forming the automatic supply bag W10, 20 is a width-determinable groove, and 21 is a plurality of printed boards mounted in multiple stages on the rack 20. , 22 is a pallet on which the rack 20 can be fixedly mounted on one side with reference to one side.

Reference numerals 31 to 34 constitute the carry-in section 30; 31 is a pair of carry-in belts; 32 is a pair of drive rollers for driving the carry-in belt 31; 33 is a motor that drives the drive rollers 32;
34 is a rack detection sensor provided at the front end of the loading section.

41 to 49 constitute a set part 40, 41 is two pairs of guide shafts arranged between the holding arm 13 and the base 12, and 42
4 is a rotatable drive shaft that is supported by the holding arm 13 and the base 12 and is threaded; 43 is a motor that rotates the drive shaft in forward and reverse directions; 44 is screwed to the drive shaft 42;
a lifter guided by 1 and moved up and down by a drive shaft 42; 45 a pair of moving belts provided on the lifter 44; 46;
47 is a sensor that detects when the lifter 44 has been raised until the moving belt 45 is at the same position as the carrying-in belt 31; 47a is a sensor that indicates that the moving belt 45 is the same as the carrying-out belt described later. a sensor 48 for detecting that the lifter 44 has been lowered to the position;
48a is a sensor that detects that the lifter 44 has descended to a position where it can supply the lowest printed board 21 to the guide conveyor section 60; A sensor 49 detects that the lifter 44 has been lowered to the lower position.
44 is a sensor that detects the rack 20 provided in the front part.

Reference numerals 51 to 57 constitute the extrusion mechanism 50, 51 is an air cylinder, 52 is a push rod that slides within the air cylinder 51 and expands and contracts by air pressure, and 53 is provided between the side plates 15 and 15 to guide the air cylinder 51. a pair of guide shafts,
54 is a rotatable drive shaft that is held on the side plate 15 and has a screw carved therein; 55 is a motor that drives the drive shaft 54 in forward and reverse rotation;
6 is a band sensor that detects the magnetic force of a magnet provided at the rear end of the pressing rod 52 and detects that the pressing rod 52 is fully extended; 57 is a band sensor in which the pressing rod 52 is connected to the air cylinder 5
This is a band sensor that detects when the band is completely stored in one.

61 to 69 constitute a guide conveyor section 60;
61a is a pair of left and right supply belts, 62 is a supply belt 61
A pair of drive rollers 62a drive the drive roller 62.
62b is a motor that rotationally drives the drive shaft 62a, 63 and 63a have guides along the upper end of the supply belt 61 and drive the supply belt 61.61a and drive rollers 62.62.
A pair of left and right guide plates 64 and 64a are provided at the front and rear ends of the guide conveyor section 60 to hold the supply belt 6.
1.61a is a spindle of the idle roller wound around, 65 is a spindle provided at the rear of the guide conveyor section 60, 66 is a sensor for detecting a printed board provided at the front end, 66a is a sensor for detecting the conveyor belt 2, 66b is a sensor that detects the rear end of the print t& that has been pushed out to the guide conveyor section 60;
67 is a holding plate that holds the motor 62b fixedly and is fixedly held together with the right guide plate 63a by support shafts 64, 64a and 65; 68 is a holding plate that is pivoted between the guide plate 63a and the holding plate 67, and connects a screw carved therein with the left side guide plate 63a; A drive shaft 69 screwed into the guide plate 63 is a motor that drives the drive shaft 68 in forward and reverse rotation.

71 to 78 constitute a drive mechanism section 70 consisting of a vertical drive mechanism and an angle drive mechanism, 71 is a support plate, 72 is a front arm that projects above the front end of the support plate 71 and pivotally supports the support shaft 64, and 73 is a support A rear arm protruding downward from the rear of the plate 71 to form an L-shape; 74 is an air cylinder whose one end is pivotally supported by the rear arm 73 and is swingable; 75 is an air cylinder that expands and contracts with the air pressure of the air cylinder 74 and has its tip attached to a support shaft 65; A rod 76 is supported by the base 12 and the holding arm 14 and guides the support plate 71. A rod 77 is threaded and is supported by the base 12 and the holding arm 14. The drive shaft 7 is screwed into the support plate 71 with a screw carved by the
8 is a motor that drives the drive shaft 77 to rotate in forward and reverse directions. The rod 75 is provided with a band stopper whose position can be changed arbitrarily, so that the amount of expansion and contraction can be adjusted.

Reference numerals 81 to 84 constitute the carry-out section 80, 81 is a carry-out belt, 82 is a drive roller of the carry-out belt 81, 83 is a motor that rotationally drives the drive roller 82, and 84 detects that the rack 20 or pallet 22 has passed. It is a sensor.

90 is a control unit, 91 is an input means such as a keyboard, 9
2 is a display means such as a CRT, and 93 is a control body.

FIG. 3 is a partial sectional view showing a state in which the printed board 21 in FIG. 1 is being fed from the guide conveyor section 60 to the conveyor belt 2 of the soldering apparatus 1.

FIG. 4 is a block diagram showing the connection relationship between the control section 90 and each mechanical section. Reference numeral 94 represents a storage means such as a RAM or a flexible disk provided in the control main body 93. 31
0 is a carry-in belt drive means that drives the carry-in belt 31 clockwise in FIG. 4
Reference numeral 50 indicates a moving belt driving means that includes a drive roller 46 and a motor (not shown) built into the lifter 44 and drives the moving belt 45 clockwise (forward rotation) and counterclockwise (reverse rotation); 520 extends and contracts the pressing rod 52; Pressure rod drive means 500 consisting of an air cylinder 51 for
6 and 10 are extrusion mechanism moving means consisting of a drive shaft 54 and a motor 55 and moving the extrusion mechanism 50 left and right, and 6 and 10 are supply belts consisting of a drive roller 62, a drive shaft 62a, and a motor 62b and driving the supply belt 61 clockwise. drive means, 6
30 is a left guide plate 63 consisting of a drive shaft 68 and a motor 69.
and left side portion moving means 74 for moving the left guide portion consisting of the left supply belt 61 and the left drive roller 62 from side to side.
0 is an angle drive mechanism 78 which is composed of an air cylinder 74 and a rod 75 and swings the guide conveyor section 60 from a horizontal position to an angle corresponding to the inclination angle of the conveyor belt 2;
0 is a vertical drive mechanism that is composed of a drive shaft 77 and a motor 78 and moves the guide conveyor section 60 up and down; 810 is a drive roller 8;
2 and a motor 83, it is a delivery belt driving means that drives the delivery belt 81 counterclockwise.

The operation of such automatic supply device 10 will be explained using the flowchart shown in FIG.

In step 101, the input means 91 inputs the figure number and width of the printed board 21 to be soldered, the number of printed boards mounted on each rack 20, and the rack 2.
The interval pitch of the printed board 21 of 0, the number of racks 20,
and the driving speed of the conveyor belt 2, etc., are inputted to the storage means 9.
4 to be memorized.

In step 102, the interval between the conveyor belts 2 is made to match the width of the printed board 21.

In step 103, the left guide section is widened to its maximum width by the left side moving means 630, and then narrowed until the conveyor belt sensor 66a detects the left conveyor belt 2, thereby adjusting the interval between the left and right guide sections. Match the interval of belt 2.

In step 104, the extrusion mechanism moving means 500
The extrusion mechanism 50 is moved to the center of the width of the printed board 21 stored in the storage means 94.

In step 105, the rack 2 equipped with print Fi21 is
The pallet 22 with 0 fixed thereon is mounted on the carry-in belt 31.

In step 106, the carry-in belt drive means 310 drives the carry-in belt 31 until the rack sensor 34 detects that the rack 20 mounted on the pallet 22 has completed passing, and at the same time, the carry-in belt 31 is driven by the carry-in belt drive means 310 until the rack sensor 49 detects that the rack 20 has arrived. The moving belt 45 is rotated in the normal direction until it is detected.

In steps 1'07, 108, and 109, the lifter 44 is lowered by the lifter moving means 440 until the rack 20 is mounted or the lifter sensor 48 detects the lid 44. In this state, the lowermost printed board 21 of the can 20 stops at the same height as the pressing rod 52.

In step 110, the pressing rod driving means 520 extends the pressing rod 52'' until the band sensor 56 detects the detection, and presses the center of the rear end of the printed board 21 to slide the printed board 21 out of the rack 20. Until the printed board sensor 66b detects the passing of the rear end of the printed board 21, the supply belt driving means 610 causes the supply bell) 61
．． 612 is driven. Furthermore, until the band sensor 57 detects the pressing rod 52 that pushed out the print #i21 from the rack 20 and delivered it to the guide conveyor part 60,
The pressing rod driving means 520 causes the pressing rod to be retracted.

In step 111, the guide conveyor section 60 carrying the printed board 21 is tilted by the angle drive mechanism 740 until it becomes the same angle as the conveyor belt 2, and at the same time, the front end of the supply belt t61.61a is tilted by the vertical drive mechanism 780. Raise it until it matches the tip of the conveyor belt 2. At this time, the amount of expansion and contraction of the air cylinder 74 and the motor 7
By setting the rotation amount of 8 in advance, an appropriate inclination angle and rise amount can be obtained.

In step 112, the supply belt driving means 61 continues until the printed board sensor 66 detects the rear end of the printed board 21.
0 is stored in the storage means 94.The supply belt t.61.61a is driven at the same speed as the speed of the conveyor belt 2, and the printed board 21 is smoothly delivered to the conveyor belt 2.

In step 113, the angle drive mechanism 740 returns the guide conveyor section 60 that has delivered the printed board 21 to a horizontal state, and at the same time, the vertical drive mechanism 780 moves the press rod 5
2, and return it to a state where it can receive the printed board 21 from the rack 20.

In Step 7 114, the lifter moving means 440 lowers the lifter lid 44 by a preset distance pitch between the printed boards 21 of the rack 20.

In step 115, the last printed board 2 in the rack 20 is
It is determined whether the lifter sensor 48a detects that the lifter 44 has descended to the position where it has supplied 1. If the lifter 44 has not reached it yet (NO
) Jump to step 110, and if arrival is detected (YES), proceed to the next step.

In step 116, the lifter moving means 440 lowers the lifter 44 until the lifter sensor 47a detects the lifter 44.

In step 117, the moving belt driving means 450 drives the moving belt 45 in reverse until the rack sensor 84 detects the rear end of the rack 20, and at the same time, the carrying out belt driving means 810 drives the carrying out belt to load the empty rack 20. The pallet 22 is moved from the lifter 44 to the unloading section 80.

In step 118, the lifter sensor 47
The lifter 44 is raised by the lifter moving means 440 until 4 is detected.

In step 119, it is determined whether there is a rack 20 to be processed next, and if there is no next rack 20 (No)
If all is completed and the next rack 20 is available, the process proceeds to the next step. The presence or absence of the next rack is determined by subtracting it from the number of racks scheduled to be processed in the control body each time the rack sensor 84 detects the passage of a rack 20, and calculating whether the number of remaining racks has become 0.

In step 120, the control main body 93 compares whether the width of the printed board 21 mounted on the next rack 20 matches that of the previous one. If the conditions match (YES), the process returns to step 105, and if they do not match (No), the process returns to step 102. Regarding differences in conditions other than the width of the printed board 21, step 101
Since the settings have already been made in step 111, the processing will be performed sequentially according to the stored conditions.However, if there is a change in the speed of the conveyor belt 2, the display means 92
This is a warning to prompt you to change the speed.

In the above explanation, the vertical drive means 780 may be driven by an air cylinder (and the angle drive mechanism 740 may be driven by a motor. Also, in step 102 of FIG. 5, the width adjustment of the conveyor belt 2 and By adjusting the angle with a motor and controlling the drive speed of the conveyor belt 2 with the control body 93, it becomes possible to quickly respond to a wide variety of printed boards and soldering conditions.In addition, each sensor can be equipped with an optical sensor. (A microswitch or a proximity sensor may also be used.) Furthermore, sensor 34°49.84
may detect the pallet 22 instead of the rack 20 itself.

〔Effect of the invention〕

As described in detail above, the present invention presses the center of the rear end of the set printed boards, so the printed boards can be pushed out smoothly and quickly (reliably one by one) from the rack with a simple mechanism, and the printed boards can be pushed out one by one from the rack with a simple mechanism. Since the conveyor section is horizontal when receiving printed boards and matches the inclination and height of the conveyor belt only when sending out printed boards, the conveyor section can transfer printed boards from the rack to the conveyor belt smoothly and reliably. Further, since only the guide conveyor section is moved up and down and driven angularly, the movable section can be small and control is easy.

Furthermore, it can quickly respond to printed boards of various sizes and soldering conditions, and a wide variety of printed boards can be automatically supplied to the soldering device, which is extremely effective in significantly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention, Fig. 2 is a partially sectional plan view of Fig. 1, and Fig. 3 is an embodiment of the present invention in which a printed board is being fed to a conveyor belt. FIG. 4 is a block diagram of an embodiment of the present invention, and FIG. 5 is a flowchart for explaining the present invention in detail. 1-Soldering device, 2--Conveyor belt, 10--Automatic supply device, 20--Rack, 21--Printed board, 30--Carry-in section, 40--Sent throat section, 5
0-extrusion mechanism, 60--guide conveyor section, 70--drive mechanism section, 80--exit section, 740-angle drive mechanism, 780--vertical drive mechanism.

Claims (1)

[Claims] It has a carrying-in section for a rack on which a plurality of printed boards are mounted, a setting section for setting the carried-in racks in a predetermined position, and a feeding section for taking out printed boards one by one from the rack and sending them out. In a device that supplies printed circuit boards one by one to a soldering device, the feeding section includes an extrusion mechanism that presses the center part of the rear end of the printed circuit board after the printed circuit board is set in a predetermined position by the setting section, and a The present invention is characterized by having a guide conveyor that guides and feeds both ends of the printed board, a vertical drive mechanism that sets the height of the guide conveyor, and an angle drive mechanism that sets the angle of the guide conveyor. Automatic feeding device for printed boards.